"My knee did not feel too good, so we're going to let it rest and see if rest can help it and then make a decision when the game comes," Harrison said. "If the game was today, I could not play."

Traditionally, under coach Mike Tomlin, players who do not practice Friday do not play Sunday.

Harrison was removed last week from the physically unable to perform list, and he made it through practices Monday and Wednesday in a limited capacity.

He acknowledged that his knee was experiencing pain and discomfort, and some soft tissue has yet to heal from surgery last month.

Also Friday, running back Rashard Mendenhall was listed as doubtful for the Denver game as he continues to recover from a torn ACL. Backup Isaac Redman said his ankle feels better, and he indicated that he and Jonathan Dwyer would split carries against the Broncos.